Chicken: Mix flour, cornstarch, salt and pepper in a bowl. Coat chicken with flour mixture and shake off excess. Pour oil into a large pot to a depth of 3 inches. Heat oil to 350 degrees. Deep fry chicken until crisp and brown, about 5 minutes. Be sure chicken is submerged in oil. Remove chicken from oil and drain on paper towels. Place in a large mixing bowl. Pour sesame sauce over chicken and mix well. Add sesame seeds, combine well. Transfer to serving platter.